Auto detailing - Purpose of using Clay Bar:

Clay is a mixture of clay base and various abrasives. Clay along with a clay lubricant is used to remove paint contamination. Road grime, tar, bugs, rust, tree sap and even paint over spray can be removed with a clay bar. Clay bars differ in color and density but what is most important, type and amount of abrasive particles they contain. Claying does not remove the clear coat of the paint but can cause marring or dullness if used incorrectly. When using a clay bar it is important to use sufficient lubrication. It takes a few passes of clay to feel the difference on the surface of the paint. To evaluate the effectiveness of claying dry the area and assess the paint and the bar. The paint should become slick to touch. The clay bar used should be turning gray. If the clay bar is dropped it must be discarded. Check often for any large particles on the clay bar as you might unknowingly scratch the paint when claying. Claying does not replace polishing. It is a process that should be used before polishing compound is used. Claying should be used once or twice a year.